Question

import java.util.*;

class A

{

int i, j, k;

public A(int i, int j, int k)

{

this.i=i;

this.j=j;

this.k=k;

}

public String toString()

{

return "A("+i+","+j+","+k+")";

}

}

class Main

{

public static void main(String[] args)

{

ArrayList<A> aL=new ArrayList<A>();

Random rand= new Random(1000); //1000 is a seed value

for (int p=0; p<10; p++)

{

int i = rand.nextInt(100);

int j = rand.nextInt(200);

int k = rand.nextInt(300);

aL.add(new A(i, j, k));

}

System.out.println("----- Original arraylist------");

for (A a: aL)

{

System.out.println(a);

}

System.out.println("----- Sorting by first integer-------");

/*YOUR CODE - Use anonymous interface types to sort by first integer Field in A, and then

print the resulting ArrayList */

System.out.println("----- Sorting by second integer-------");

/*YOUR CODE - Use anonymous interface types to sort by the second integer Field in A, and then

print the resulting ArrayList */

System.out.println("----- Sorting by third integer-------");

/*YOUR CODE - Use anonymous interface types to sort by the third integer Field in A, and then

print the resulting ArrayList */

}

}

Ideal Output:

----- Original list ------- A(87,135,276) A(24,192,149) A(41,45,164) A(50,179,259) A(72,183,36) A(75,46,202) A(23,41,222) A(71,189,202) A(93,142,49) A(42,35,176) ----- Sorting by first integer------- A(23,41,222) A(24,192,149) A(41,45,164) A(42,35,176) A(50,179,259) A(71,189,202) A(72,183,36) A(75,46,202) A(87,135,276) A(93,142,49) ----- Sorting by second integer------- A(42,35,176) A(23,41,222) A(41,45,164) A(75,46,202) A(87,135,276) A(93,142,49) A(50,179,259) A(72,183,36) A(71,189,202) A(24,192,149) ----- Sorting by

Answer 1

Thanks for the question, Here is the complete code in Java. Have used anonymous interface Comparator to sort the array list

=======================================================

import java.util.*;
import java.util.ArrayList;

public class A {
    int i, j, k;

    public A(int i, int j, int k) {
        this.i = i;
        this.j = j;
        this.k = k;
    }

    public String toString() {
      return "A(" + i + "," + j + "," + k + ")";
    }
}

class Main {
    public static void main(String[] args) {
        ArrayList<A> aL = new ArrayList<A>();
        Random rand = new Random(1000); //1000 is a seed value
        for (int p = 0; p < 10; p++) {
            int i = rand.nextInt(100);
            int j = rand.nextInt(200);
            int k = rand.nextInt(300);
            aL.add(new A(i, j, k));
        }
        System.out.println("----- Original arraylist------");
        for (A a : aL) {
            System.out.println(a);
        }
        System.out.println("----- Sorting by first integer-------");
/*YOUR CODE - Use anonymous interface types to sort by first integer Field in A, and then
print the resulting ArrayList */
        Collections.sort(aL, new Comparator<A>() {
            @Override
            public int compare(A objA, A objB) {
                return objA.i - objB.i;
            }
        });
        for (A a : aL) {
            System.out.println(a);
        }
        System.out.println("----- Sorting by second integer-------");
/*YOUR CODE - Use anonymous interface types to sort by the second integer Field in A, and then
print the resulting ArrayList */
        Collections.sort(aL, new Comparator<A>() {
            @Override
            public int compare(A objA, A objB) {
                return objA.j - objB.j;
            }
        });
        for (A a : aL) {
            System.out.println(a);
        }
        System.out.println("----- Sorting by third integer-------");
/*YOUR CODE - Use anonymous interface types to sort by the third integer Field in A, and then
print the resulting ArrayList */
        Collections.sort(aL, new Comparator<A>() {
            @Override
            public int compare(A objA, A objB) {
                return objA.k - objB.k;
            }
        });
        for (A a : aL) {
            System.out.println(a);
        }
    }
}

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